Re: [Xen-devel] [PATCH v2 06/22] PCI/MSI: Introduce weak arch_find_msi_chip() to find MSI chip

[Thierry Reding <thierry.reding@xxxxxxxxx>]

On Thu, Sep 25, 2014 at 11:14:16AM +0800, Yijing Wang wrote:
> Introduce weak arch_find_msi_chip() to find the match msi_chip.
> Currently, MSI chip associates pci bus to msi_chip. Because in
> ARM platform, there may be more than one MSI controller in system.
> Associate pci bus to msi_chip help pci device to find the match
> msi_chip and setup MSI/MSI-X irq correctly. But in other platform,
> like in x86. we only need one MSI chip, because all device use
> the same MSI address/data and irq etc. So it's no need to associate
> pci bus to MSI chip, just use a arch function, arch_find_msi_chip()
> to return the MSI chip for simplicity. The default weak
> arch_find_msi_chip() used in ARM platform, find the MSI chip
> by pci bus.

Can't x86 simply set the bus' .msi field anyway? It would seem to be
easy to do and unifies the code rather than driving it further apart
using even more of the __weak functions.

Thierry

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